Sole for footwear for unstable surfaces



FIG. 1 shows a top perspective view of a sole for footwear for unstable surfaces incorporating the new, original and ornamental design; and,

FIG. 2 shows a bottom perspective view thereof.

The broken lines in the drawings are included for the purpose of illustrating environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for a sole for footwear for unstable surfaces, as shown and described. 